Why won't fuel flow to the fuel filter on my CraftsmanThe fuel from the tank is moved through the in-line filter and fuel lines by the fuel pump. On engines not equipped with a fuel pump, the fuel tank outlet is located above the carburetor inlet allowing gravity to feed fuel to the carburetor. This explains why fuel is not free flowing to the fuel filter. Check the following:Your engine uses a pulse type fuel pump that pulls fuel out of the tank and through the pulse fuel pump to the carburetor bowl. There are 3 hoses connected to the fuel pump, two of the hoses are fuel lines and one is the pulse line.
You may have a bad fuel pump or cracks in one of the 3 hoses connected to the fuel pump. See image below.
The fuel from the tank is moved through the in-line
filter and fuel lines by the fuel pump. On engines not
equipped with a fuel pump, the fuel tank outlet is
located above the carburetor inlet allowing gravity to
feed fuel to the carburetor. This explains why fuel is not free flowing to the fuel filter.
Check the following:
Make sure the vent in fuel tank is open.
Make sure the fuel valve is open.
Make sure vacuum and fuel lines to fuel pump are secured and in good condition.
Check the operation of fuel pump.
Remove the fuel line from the inlet fitting of carburetor.
Crank the engine several times and observe flow
If fuel does flow from the line, check for faulty
carburetor.
If fuel does
not
flow from the line, check for a clogged fuel line. If the fuel line is unobstructed, check for overfilled crankcase and/or oil in pulse line.
If none of the checks reveal the cause of the problem, replace the pump.
To replace the pulse pump follow these
steps. Note the orientation of the pump before
removing.
Disconnect the fuel lines from the inlet, outlet and pulse fittings on fuel pump.
Remove the two mounting screws and take off the pump.
Connect the pulse line to the new fuel pump and make sure opposite end is properly connected into valve cover. NOTE: Make sure the orientation of the new pump is consistent with the removed pump. Internal damage may occur if installed incorrectly.
Attach the new fuel pump using the hex flange screws. Torque the screws to 2.3 NÂ·m (20 in. lb.).
Connect the fuel lines to the inlet and outlet fittings and secure with the clamps.This is exactly what is happening on my Craftsman model 91710 tractor, except for one thing. It will run fine for about 30 minutes, then will be starved for fuel. When I pull the fuel line at the fuel filter, there is no flow. However, if I let the engine cool and start it later, it runs again like there was no problem. I have replaced the fuel, fuel line, fuel filter, and have inspected and cleaned out the fuel tank. Should I follow the same troubleshooting procedures that you listed above, or should I be looking at some other problem area? Any ideas on why this happens only after the engine gets hot? Thank you in advance for your help.I'm having the same problem. Did you get your lawnmower fixed?I found that the plastic tanks on the mowers have too small an opening in the their low center outlets. these will plug with bits of debris . I runs fine after it sits because the gravity of the gas fills the inline filter allowing the mower to run for a bit, but after awhile the gas filter goes dry, and the mower cannot pull gas from the plugged tank. When you stop the mower the debris moves away from the outlet allowing a trickle of gas to refill the gas filter allowing you to move again but not for long. I took a small piece of tubing . about an inch long and pushed it up into the tank from the bottom, sticking up above the bottom of the tank approx. 1/2" , this way the debris on the bottom of the tank doesnt gather around the outlet and plug it up.Fuel is not flowing. Have a Briggs 20hp 351777, It sat forFuel is not flowing. Have a Briggs 20hp 351777, It sat for a year. It started last time I tried it. Fuel is not flowing. Have a Briggs 20hp 351777. Mechanic's Assistant: It cranks great but fuel is not flowing thru the fuel filter. I blew air thru the line. It is not blocked. Show More. Show Less.